本文選題：探地雷達(dá) + 電磁波　； 參考：《東北林業(yè)大學(xué)》2015年碩士論文

【摘要】：隨著我國土木工程的高速發(fā)展,我國越來越多的既有建筑物由于服役年限過長,不少已經(jīng)進(jìn)入維修階段,對仍需服役的老舊建筑物進(jìn)行改造的任務(wù)十分重要。目前,大量的既有建筑物地基基礎(chǔ)缺乏技術(shù)資料,即便可搜到某些建筑物竣工圖,也需要對其長期使用后的地基基礎(chǔ)現(xiàn)狀進(jìn)行再確認(rèn),方可作為技術(shù)依據(jù)進(jìn)行改造設(shè)計(jì)。目前用于地球淺層的勘測工具種類較多,其中探地雷達(dá)無疑是其中最為重要的一種。該勘測工具的無損探測優(yōu)勢較明顯,同時(shí)有能夠應(yīng)對較強(qiáng)的輻射干擾以及分辨率高的優(yōu)勢。通過探地雷達(dá)技術(shù)對老舊橋梁基礎(chǔ)進(jìn)行探測,可較為準(zhǔn)確地掌握基礎(chǔ)形態(tài)以及擴(kuò)大基礎(chǔ)的基本尺寸,給改造設(shè)計(jì)提供重要依據(jù)。本文在錦州鐵路大橋雷達(dá)探測試驗(yàn)和寧安河西大橋雷達(dá)探測試驗(yàn)的基礎(chǔ)上,結(jié)合實(shí)際探測流程和探測圖像,對探地雷達(dá)在橋梁基礎(chǔ)探測方面的應(yīng)用進(jìn)行研究,具體內(nèi)容如下：1.闡述了探地雷達(dá)探測技術(shù)當(dāng)前的應(yīng)用情況,并提出了其應(yīng)用的重要性,同時(shí)分析了其在橋梁擴(kuò)大基礎(chǔ)探測使用方面的優(yōu)勢和主要特點(diǎn)。引入了探地雷達(dá)探測橋梁擴(kuò)大基礎(chǔ)這一新的研究方向。2.闡述了探地雷達(dá)進(jìn)行橋梁擴(kuò)大基礎(chǔ)探測的基本理論,并從淺層探測的分辨率計(jì)算來分析這種探測模式的在探測擴(kuò)大基礎(chǔ)的可行性。主要介紹的應(yīng)用理論為電磁波理論,同時(shí)對麥克斯韋爾方程式以及地質(zhì)淺層介質(zhì)的電磁屬性進(jìn)行了分析。3.闡述了探地雷達(dá)野外工作的準(zhǔn)備流程,并對采集圖像的處理和解釋方法進(jìn)行了詳細(xì)說明,分析了影響探測精度的因素。4.在兩個(gè)探測試驗(yàn)的基礎(chǔ)上,結(jié)合實(shí)際操作,驗(yàn)證了擴(kuò)大基礎(chǔ)的實(shí)際探測方法,進(jìn)一步探討了雷達(dá)參數(shù)的選擇和介電常數(shù)的設(shè)置。結(jié)合試驗(yàn),對比總結(jié)了擴(kuò)大基礎(chǔ)在探地雷達(dá)圖像中的顯現(xiàn)特征,以及常見的干擾情況。最后驗(yàn)證了探測擴(kuò)大基礎(chǔ)試驗(yàn)的有效性,證明探地雷達(dá)在橋梁基礎(chǔ)的無損探測方面的應(yīng)用是可行且有效的,具有重要的現(xiàn)實(shí)意義。
[Abstract]:With the rapid development of civil engineering in our country, more and more existing buildings in our country have entered the stage of maintenance because of their long service life, so it is very important to rebuild the old buildings which still need to be in service. At present, a large number of existing building foundation is lack of technical data, even if some building completion drawings can be found, it is necessary to reconfirm the status quo of foundation after its long-term use before it can be used as the technical basis for reconstruction and design. At present, there are many kinds of surveying tools used in the shallow layer of the earth, among which ground penetrating radar is undoubtedly the most important one. This survey tool has obvious advantages of nondestructive detection and has the advantages of strong radiation interference and high resolution. Through the ground penetrating radar technology to detect the old bridge foundation, we can accurately grasp the foundation shape and expand the basic size of the foundation, and provide an important basis for the reconstruction design. On the basis of radar detection test of Jinzhou Railway Bridge and Ningan Hexi Bridge, this paper studies the application of ground penetrating radar in bridge foundation detection based on actual detection flow and image. The concrete contents are as follows: 1. This paper expounds the current application of ground penetrating radar (GPR) technology, and points out the importance of its application. At the same time, the advantages and main features of GPR in expanding the use of bridge foundation detection are analyzed. This paper introduces the new research direction of expanding the foundation of GPR detection bridge. This paper expounds the basic theory of GPR for bridge expansion foundation detection, and analyzes the feasibility of this kind of detection mode from the resolution calculation of shallow detection. The main application theory is electromagnetic wave theory. The Maxwell equation and the electromagnetic properties of geological shallow media are analyzed. The preparation flow of field work of ground penetrating radar is described, and the processing and interpretation methods of collected images are explained in detail, and the factors that affect the detection accuracy are analyzed. On the basis of two detection experiments, combined with practical operation, the practical detection method of expanding the foundation is verified, and the selection of radar parameters and the setting of dielectric constant are further discussed. Combined with the experiments, the features of the expanded foundation in GPR images and the common interference are compared and summarized. Finally, it is proved that the application of GPR in the nondestructive detection of bridge foundation is feasible and effective, and has important practical significance.
【學(xué)位授予單位】：東北林業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U446

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本文編號(hào)：2017214